I have the problem as well on my netbook (Asus eeePC 1000H) running
Ubuntu 10.10.
My wireless card reports negative values for the signal level for "bad"
APs and positiv values for the good AP. As the noise value is not
reported (noise == 0) the quality of all signals is considered as
maximal.
At the moment I think that the network manager, either consider quality instead
of signal level to choose an AP or that it has problems with the mixing of
negative and positive values.
As those values comes from the driver, I think the easiest way is to fix the
network manager to handle this situation correctly.
Here is some example output from iwlist scan. The network manager tries
to connect to the AP with MAC addr 00:03:52:29:62:43, which is actually
the worst one considering the signal level.
Cell 01 - Address: 00:03:52:29:62:43
Channel:9
Frequency:2.452 GHz (Channel 9)
Quality=70/70 Signal level=-188 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000000086a538af7
Extra: Last beacon: 16ms ago
IE: Unknown: 0007656475726F616D
IE: Unknown: 010882848B960C121824
IE: Unknown: 030109
IE: Unknown: 2A0100
--
Cell 12 - Address: 00:03:52:1C:18:43
Channel:9
Frequency:2.452 GHz (Channel 9)
Quality=70/70 Signal level=50 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=00000008848ace68
Extra: Last beacon: 460ms ago
IE: Unknown: 0007656475726F616D
IE: Unknown: 010882848B960C121824
IE: Unknown: 030109
IE: Unknown: 2A0100
--
Cell 16 - Address: 00:03:52:1B:F5:03
Channel:9
Frequency:2.452 GHz (Channel 9)
Quality=70/70 Signal level=-182 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000000090231fecc
Extra: Last beacon: 1168ms ago
IE: Unknown: 0007656475726F616D
IE: Unknown: 010882848B960C121824
IE: Unknown: 030109
IE: Unknown: 050400010000
--
Cell 18 - Address: 00:03:52:1C:32:93
Channel:9
Frequency:2.452 GHz (Channel 9)
Quality=70/70 Signal level=-182 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000000089c363177
Extra: Last beacon: 536ms ago
IE: Unknown: 0007656475726F616D
IE: Unknown: 010882848B960C121824
IE: Unknown: 030109
IE: Unknown: 050400010000
--
Cell 21 - Address: 00:03:52:1C:24:43
Channel:9
Frequency:2.452 GHz (Channel 9)
Quality=70/70 Signal level=-181 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=00000008783cd417
Extra: Last beacon: 548ms ago
IE: Unknown: 0007656475726F616D
IE: Unknown: 010882848B960C121824
IE: Unknown: 030109
IE: Unknown: 050400010000
--
Cell 25 - Address: 00:03:52:1C:08:C3
Channel:13
Frequency:2.472 GHz (Channel 13)
Quality=70/70 Signal level=-183 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000000087d525e68
--
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/111502
Title:
network-manager unreliable with multiple APs
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